Small insect attractant / capture sheet

Abstract

To answer a need for a technique that has visual contrast on the basis of the total illumination including transmitted light, and also to answer a need for a technique that provides not a single type but multiple types and forms of visual contrast in order to attract many types of minute insects because it is thought that the conditions for visual contrast to which insects are attracted differ depending on the type of minute insects.SOLUTION: Provided is a woven sheet for attracting minute insects, in which both the warp and the weft constituting the sheet are flat yarns obtained by slitting and drawing a translucent synthetic resin film.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates primarily to a woven sheet that attracts and captures small insects. [Background technology]

[0002] In order to attract and capture tiny insects (pests) such as thrips, whiteflies, aphids, and leafminers, insect trapping sheets having adhesive layers colored in yellow, blue, or other colors that attract tiny insects (pests) are widely used.

[0003] Recent research has shown that when flying tiny insects (pests) approach and land on a target, visual contrast based on differences in brightness and color near the target plays an important role, and that tiny insects are easily attracted to the boundary between brightness and color (edge ​​effect). Figures 6 and 7 are photographs capturing the flight and landing posture of tiny insects, showing how they set their target at a position quite far from the landing point and adjust their flight posture.

[0004] Focusing on this effect, there is a technology that describes the positional relationship of colored layer regions that reflect two different attracting colors (Patent Document 1). The structure that reflects two different attracting colors creates a color difference in the reflected light on the surface of the insect trapping sheet, which creates a greater light contrast and improves the attracting effect.

[0005] There is also a technology in which numerous convex portions are formed on the base layer of an insect trapping sheet (Patent Document 2). By embossing, the difference in reflected light based on the amount of light irradiated causes the convex portions to become brighter and the concave portions (flat portions) to become darker, creating a contrast of light and darkness. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2019-135996 [Patent Document 2] Patent Publication No. 2011-36153 Summary of the Invention [Problem to be solved by the invention]

[0007] All of the above technologies focus on the visual contrast of either color or brightness due to reflected light. However, visual contrast is perceived by micro-insects based on the total amount of light irradiated, including transmitted light. Furthermore, if sunlight or other light is on the opposite side of the insect trapping sheet, the color difference or brightness difference of the reflected light received is reduced, and a sufficient edge effect cannot be achieved. Therefore, a technology that provides visual contrast based on the total amount of light irradiated, including transmitted light, is required. Furthermore, since the conditions for visual contrast that attract different types of micro-insects are thought to differ, a technology that provides visual contrast of multiple types and patterns, rather than a single type, is required to attract a wide variety of micro-insects. Furthermore, since insect trapping sheets are used for long periods of time and in large quantities, they are required to be durable materials with a low environmental impact. [Means for solving the problem]

[0008] In order to solve the above problem, a woven sheet for attracting small insects is provided, characterized in that the warp and weft threads constituting the sheet are both flat yarns made by slitting and stretching a translucent synthetic resin film.

[0009] Generally, thread is defined as "a fiber that has been stretched thin and long and then twisted," and is divided into spun thread and filament thread, but the threads that make up the micro-insect attracting sheet of the present invention, both warp and weft, are tape-like in shape, having been stretched after slitting a synthetic resin film. They are called flat yarn, tape yarn, tape yarn, etc., but in this specification they will be referred to as "flat yarn."

[0010] The term "translucent" means that the sheet has the property of transmitting part of the light from the sun or a light source irradiated from the backside of the sheet.

[0011] The type of synthetic resin that is the material for the warp and weft threads is not particularly limited, but polyethylene and polypropylene are preferred from the viewpoints of light transmittance and weaving / knitting processing. "Weaving / knitting" is a collective term for weaving and knitting, and although not limited, weaving is more preferred. In the case of weaving, the weaving method is appropriately selected from plain weave, twill weave, satin weave, leno weave, etc., and in the case of knitting, the knitting method is appropriately selected. In terms of increasing the unevenness of the sheet and increasing the light transmitted through the gaps on the sides of the warp or weft threads, twill weave, satin weave, and leno weave are preferred.

[0012] A woven sheet has at least a single layer portion where only warp or weft threads are present, and a multi-layer portion where warp and weft threads overlap. There are also void portions where neither warp nor weft threads are present. Therefore, a woven sheet will have varying degrees of light transmittance based on the three patterns of partial structure of the sheet, depending on whether or not there are overlapping threads. (In addition, if there are bent portions in the warp and weft threads or if the thicknesses of the warp and weft threads are different, the number of different degrees of light transmittance will increase even further.) The number of void portions is affected by the density of the arrangement of the warp and weft threads and the weaving conditions.

[0013] Also provided is a woven sheet for attracting small insects, characterized in that the total warp width, calculated by adding up the widths of all the warp threads constituting the sheet, exceeds the overall width of the sheet, or the total weft width, calculated by adding up the widths of all the weft threads constituting the sheet, exceeds the overall length of the sheet and is densely arranged.

[0014] The total length of a sheet refers to the total dimension along the weaving direction of the sheet, and the total width of a sheet refers to the total dimension along the direction perpendicular to the weaving direction of the sheet. The width of the warp or weft threads constituting the width of all warp threads or the width of all weft threads refers to the width of each warp or weft thread in a flat state without any deformation such as folding. Therefore, the total warp width, which is the sum of the widths of all the warp threads, exceeds the total width of the sheet, or the total weft width, which is the sum of the widths of all the weft threads, exceeds the total length of the sheet.

[0015] In the present invention, when the total warp width, calculated by adding up the widths of all the warp threads, exceeds the overall width of the sheet, or when the total weft width, calculated by adding up the widths of all the weft threads, exceeds the overall length of the sheet, the excess is absorbed by warp or weft bends that occur in all weaving processes, including the preceding process. The warp or weft threads that make up the sheet have a cross-sectional shape with an increased thickness in part or in whole, due to the bends.

[0016] In a woven or knitted sheet, in addition to the above-mentioned single-layer portion, multi-layer portion, and void portion, folded portions occur due to bending of warp or weft yarns. Since it is difficult to design or predict where and how folds will occur in a weaving or knitting process, the positions of the folded portions become irregular and the folding patterns vary. Furthermore, since voids are more likely to occur as folds occur, numerous and irregular voids also occur.

[0017] The thread width and thread thickness are not particularly limited, but the thread thickness and the ratio of thread width to thread thickness are designed so that folding portions can be generated during weaving or the like.

[0018] The present invention also provides a woven or knitted sheet characterized in that the warp or weft is a flat yarn obtained by slitting and stretching a translucent synthetic resin film and folding it before weaving.

[0019] Before the weft or warp yarns are set on the loom or knitting machine, they can be passed through a tape guide machine or the like to generate folded portions in advance. By generating folded portions in advance, the occurrence of folded portions during weaving or knitting is reduced.

[0020] Also provided is a minute insect trapping sheet in which a substance for trapping minute insects is added to the surface of the warp or weft threads constituting the woven or knitted sheet.

[0021] This trapping sheet captures attracted tiny insects with adhesive or other substances. Adding a trapping substance includes, but is not limited to, spraying a spray-type adhesive onto the surface of the warp and weft threads, or attaching tiny hook-shaped materials to the surface of the warp and weft threads. In the case of spray-type adhesives, yellow, blue, or green colors are preferred.

[0022] Further, a micro-insect capture sheet is provided, which is characterized in that a covering material layer made of a translucent covering material is formed on both sides of the woven sheet, and an adhesive layer made of a translucent adhesive material is formed on top of the covering material layer.

[0023] Both sides of the sheet are covered with a covering material, and an adhesive is applied on top of that. The covering material is preferably polyethylene, which has excellent light transmission and processability, but is not particularly limited. The adhesive material is also not particularly limited as long as it is light transmissive. When the attracting sheet is covered with a covering material of a certain thickness by processing such as lamination, the surface of the covering material will have a smooth uneven shape that follows the unevenness of the single layer portion (warp portion, weft portion), overlapping portion, void portion, and (folded portion).

[0024] The present invention also provides a minute insect trapping sheet, characterized in that the translucent covering material is a translucent covering material having a yellow, blue or green color.

[0025] By adjusting and adding pigments to the covering material, a translucent sheet for capturing small insects can be obtained that is yellow, blue, or green in color and has light transmission. The method for imparting color is not particularly limited. The brightness, hue, saturation, and transparency of the color can be selected appropriately.

[0026] The present invention also provides a minute insect trapping sheet, wherein the adhesive layer is formed by transfer coating the adhesive.

[0027] The adhesive layer can be formed by a coating method (transfer coating) in which the adhesive is transferred from a roll to the substrate while maintaining a uniform thickness of the adhesive, or by a normal coating method in which the adhesive is applied to the adhesive coating layer. The former method is preferred in order to form a surface shape with irregularities that follow the surface of the coating. The coating layer can be formed by laminating a pre-formed coating material onto the micro-insect attractant sheet, or by applying a molten coating material and cooling it to assimilate it. The former method is more preferred in order to form a layer that follows the cross-sectional shape of the sheet.

[0028] Also provided is a method for producing a micro-insect trapping sheet, which comprises slitting a translucent synthetic resin film and then stretching it, using the resulting flat yarns as warp and weft threads that form a woven sheet, densely arranging and weaving all of the warp threads or all of the weft threads that form the woven sheet so that the total width of all of the warp threads or all of the weft threads that form the woven sheet exceeds the overall width or length of the woven sheet, and covering both sides of the resulting woven sheet with a translucent covering material, and forming an adhesive layer made of a translucent adhesive material on top of the covering layer made of the covering material. [Effects of the Invention]

[0029] The sheet of the present invention generates three levels of large and small transmitted light (multi-layered section, single-layered section, and void section) across the entire surface of the sheet. Regarding reflected light, differences in level are formed between the multi-layered section and the single-layered section due to differences in thread thickness, resulting in large and small reflected light between the flat section and the stepped section. This diverse range of transmitted and reflected light is irradiated onto the tiny insects, resulting in various differences in brightness and darkness due to the transmitted and reflected light. Similarly, differences in perspective, hue, and saturation occur based on the uneven shape of the sheet surface. These elements combine in a complex manner, resulting in a large number of different types of visual contrasts across the entire sheet that are visually perceived differently by tiny insects. The boundaries between these numerous visual contrasts have an edge effect that attracts tiny insects.

[0030] Furthermore, since the present invention utilizes transmitted light, it is possible to expect the effect of attracting tiny insects from both sides of the sheet.

[0031] Furthermore, since the attractant sheet according to the present invention is a woven or knitted fabric, it is easy to produce a large-sized sheet for capturing small insects, and it is resistant to weather and deterioration caused by sunlight.

[0032] The occurrence of folds in the warp or weft threads increases the pattern of light and dark and surface irregularities, and increases the number of boundary areas of visual contrast. Furthermore, the frequency and shape of folds are not uniform, and the presence of folds creates areas where the warp and weft threads are not perpendicular, resulting in an irregular arrangement of the areas (positions) where the visual contrast occurs. As a result, various patterns of visual contrast stimulation are provided in various areas (positions) depending on the type and state of flying micro-insects, further enhancing the attracting effect. Furthermore, the presence of folds increases the strength of the entire sheet.

[0033] By folding the fabric before weaving, it is possible to generate regular folds. This is effective when you want to generate a certain percentage of folds in a planned manner, depending on the production efficiency of weaving and the properties of small insects. It is also possible to generate a certain number of folds in advance, and then generate more folds during the weaving and knitting process.

[0034] The minute insect trapping sheet according to the present invention can trap minute insects that have been attracted and landed on the surface of the sheet, and can prevent a decrease in yield and quality of cultivated crops caused by minute insects.

[0035] The insect trap sheet of the present invention can trap attracted insects while increasing the strength and durability of the sheet. Because both the covering material and the adhesive material are translucent, the effect of transmitted light obtained with the attractant sheet described above can be obtained, and the contrast of reflected light can also be obtained similar to that of the attractant sheet described above.

[0036] The covering material is yellow, blue or green in color and is also translucent, so that the visual contrast is enhanced by the attraction of certain colors, which allows pests to approach more closely and be captured.

[0037] Since tiny insects tend to land on the boundary of visual contrast, it is effective for the sheet itself to have a color that the tiny insects like in order to fly close to the sheet. The colors that tiny insects like are yellow, blue, and green, and it is preferable that the sheet have these colors.

[0038] The uneven shape of the surface of the adhesive layer can produce a contrast of light and dark in the reflected light based on the steps (uneven shape) in the cross section of the sheet.

[0039] The manufacturing method of the present invention produces a sheet on which multiple levels of light-dark contrast appear in multiple locations across the entire surface of the sheet, making it possible to capture pests attracted to the boundaries of the contrast. [Brief explanation of the drawings]

[0040] [Figure 1] 1 is a schematic diagram of a sheet for attracting and capturing small insects according to the present invention (uncoated, warp and weft threads). [Figure 2] 1 is a photograph of the micro-insect attracting and capturing sheet (uncoated warp and weft threads) according to the present invention. [Figure 3] 1 is a photograph of a sheet for attracting and capturing small insects according to the present invention (uncoated, warp or weft). [Figure 4] FIG. 1 is a diagram showing the light transmittance of the uncoated sheet for attracting and capturing minute insects according to the present invention. [Figure 5] The sheet for attracting and capturing tiny insects according to the present invention (having a laminate coating layer and an adhesive layer). [Figure 6] These photographs capture the flight and landing posture of a tiny insect (a greenhouse whitefly). [Figure 7] These photographs capture the flight and landing posture of a tiny insect (onion thrips). [Figure 8] This is a diagram of a system for measuring the light transmittance of the micro-insect attracting and capturing sheet according to the present invention. (Quoted from the instruction manual for the HUS-100S high-speed spectroscopic unit manufactured by Asahi Spectroscopy Co., Ltd.) DETAILED DESCRIPTION OF THE INVENTION

[0041] The micro-insect trapping sheet according to the present invention will be described in detail below. The following is one embodiment of the present invention, and the present invention is not limited to the following embodiment. First, we will explain the woven sheet. Both the warp and weft yarns constituting the sheet are flat yarns obtained by slitting and stretching synthetic resin films. Materials include high-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, polypropylene, etc. Polypropylene can be propylene homopolymer, ethylene-propylene block copolymer, ethylene-propylene random copolymer, or a mixture thereof. Among these, polyethylene and polypropylene are preferred, taking into consideration mechanical properties such as light transmittance and stretched tape strength, as well as extrusion moldability and stretchability during manufacturing. Polyethylene has light transmittance roughly equivalent to that of plate glass and, in some cases, exhibits light transmittance superior to that of plate glass in the ultraviolet region.

[0042] A method for producing a synthetic resin flat yarn according to the present invention will now be described. First, the raw material, synthetic resin such as polyethylene, is homogenized in a mixer, melted with heat, and then extruded into a film.

[0043] The resulting unstretched film is then stretched at high speed and simultaneously slit to a width appropriate for the fineness. Slitting is performed using known methods, such as a razor blade set to the slitting width or a rotary cutter (round blade). The slit flat yarn is then stretched in the machine direction while applying heat to obtain a flat yarn of the desired thickness. The stretched warp flat yarn and weft flat yarn are each wound onto bobbins.

[0044] Next, the strain generated by the stretching is removed by heating to ensure dimensional stability of the woven or knitted fabric, etc. However, removing the strain by heating is not necessarily an essential step in the present invention. The thickness of the stretched tape is determined from the viewpoint of the objective of the present invention, namely, to provide light transmission, and from the viewpoint of sheet strength, and is preferably about 3 μm, but is not limited thereto.

[0045] The weaving or knitting using the stretched tape is carried out by a conventional weaving or knitting machine. The weaving method may be selected from plain weave, twill weave, leno weave, twill weave, etc., and the knitting method may be selected from warp knitting, weft knitting, etc.

[0046] The total width of the warp or weft threads used in weaving or knitting is greater than the overall width or length of the sheet. For 3.7 mm wide warp and weft threads, if the weaving density is 10 threads / 25.4 mm x 10 threads / 25.4 mm, then theoretically the total excess width will be approximately 11 mm per inch, and this excess width will cause the warp or weft threads to bend.

[0047] In the case of warp threads, breaks occur when a flat yarn wider than the space between the reeds is pushed in when passing the warp threads through the reeds. In the case of weft threads, breaks occur when the threads are pulled out of the cheese, when the weft is inserted, or when the reed is beaten. These breaks occur due to external forces under various conditions, so the type and frequency of breaks are not consistent and are irregular.

[0048] In addition to densely arranging warp or weft yarns during weaving, folds can be controlled by adjusting the tension of the loom. Increasing the tension of the loom can further promote the formation of folded portions, which in turn can promote the formation of voids.

[0049] It is also possible to create folds in the warp or weft yarn before it is fed into the weaving machine. For example, if the weft yarn is passed through a tape guide to form a folded shape before weaving, folds of a substantially uniform shape will be continuously created.

[0050] Figure 1 is a schematic diagram of a sheet for attracting and capturing tiny insects. The warp and weft threads are woven in a plain weave. The cross-sectional shapes of the warp threads 200 and weft threads 300 are either flat or have folded portions (210, 310), and the folded portions come in various forms, such as partially folded twice, folded entirely twice, or folded three times. Also, there are scattered voids 400 where neither warp nor weft threads exist.

[0051] Figure 2 is a photograph of a sheet according to the present invention attached to quartz glass. Both the warp and weft were made of 3 μm-thick polyethylene flat yarns, and the weft was woven at a count of 10 threads / 25.4 mm x 10 threads / 25.4 mm. Because both the warp and weft were densely arranged during weaving, breaks occurred and the parallelism between the threads and the perpendicularity of the warp and weft were disturbed. Four patterns were created: overlapping threads, warp or weft only, bent portions, and voids where no threads were present. The differences in light transmittance between these patterns resulted in contrasts of light and dark. Furthermore, because each pattern appeared irregularly, the contrasts of light and dark were also irregular.

[0052] Figure 3 shows photographs of the sheet shown in Figure 2, with only the warp threads and only the weft threads attached to quartz glass, in order to observe the difference in light transmittance. The left side of Figure 3 shows the warp threads, and the right side shows the weft threads.

[0053] Figure 4 shows the measured transmittance of light (wavelength 300-800 nm) for the warp, weft, and intersections of the warp and weft threads for the sheets shown in Figures 2 and 3. To measure the transmitted light, a transmitted light measurement unit (Asahi Spectroscopy HSU-100S) was attached to a spectrophotometer (Asahi Spectroscopy HSU-T.ST), and a xenon light source (Asahi Spectroscopy LAX-Cute) was used as the light source (Figure 8). The measurement material was a quartz glass plate (50 x 50 mm, 1 mm thick) attached to one side with no gaps so that the threads did not overlap, and the plate was set in the designated position on the transmitted light unit.

[0054] The upper dashed line represents the warp thread, the middle dotted line represents the weft thread, and the lower solid line represents the light transmittance at the intersection. The transmittance of the warp thread, weft thread, and the intersection of the warp and weft threads was measured at 10 locations, and the average was used as the actual value. The transmittance of the warp threads ranged from 8.90 to 17.02%, the transmittance of the weft threads ranged from 4.90 to 12.34%, and the transmittance of the intersections ranged from 0.89 to 2.78%. Because the measurements were taken on glass, the absolute transmittance values ​​were not high, but even these values ​​were sufficient for small insects to detect the transmitted light. Although the warp and weft threads are made of the same material, differences in the diffusion of light along the fibers are likely responsible for the differences in the measured values. The transmittance at the intersections was lower than the calculated value obtained from the individual transmittances, likely due to losses caused by the overlapping of two layers of quartz glass.

[0055] To capture the attracted tiny insects, an adhesive is applied to the woven sheet. Figure 5 is a schematic diagram of a woven sheet laminated and then coated with an adhesive layer. The warp threads are flat or have bent portions, and both sides are covered with a coating material, with an adhesive layer formed on the outside. The bent portions and voids in the warp threads cause the cross section of the sheet to have an uneven shape, but the coating material layer and adhesive layer follow the cross-sectional shape of the sheet and present a gentle uneven shape. Although the weft threads are omitted in this figure, the weft threads have the same shape as the warp threads. Note that while laminate coating increases the durability of the sheet and makes it easier to form the adhesive layer, it is also possible to apply the adhesive without the laminate coating.

[0056] The lamination and adhesive coating processes will now be explained. The woven or knitted sheet is laminated with a covering material. The covering material must be a light-transmitting material, and polyethylene is preferred for its workability, but is not limited to this.

[0057] One type of lamination is extrusion lamination. This is a technology in which thermoplastic resins such as pelletized or powdered low-density polyethylene or polypropylene are heated, kneaded, and melted, then extruded through a T-die into a film, which is then pressed onto a woven or woven substrate sheet and cooled to form a laminate. When the substrate and covering material are the same material, extrusion lamination is generally used, as it does not require adhesives and allows for low-cost mass production.

[0058] The covering material is preferably translucent and has a color of blue, yellow, or green. A colored translucent sheet is produced by pressing and cooling a thermoplastic resin such as polyethylene containing a coloring pigment onto the front and back of a woven or woven sheet. The rolled sheet is then cut into plates of the appropriate size.

[0059] There are two types of lamination using solvents: dry lamination and wet lamination. In this method, an adhesive is applied to the base, and then a covering material is applied after or before drying. Because the covering material does not melt, it can maintain its thickness before lamination.

[0060] An adhesive material is applied to the sheets that have been laminated. The adhesive can be applied by directly applying the adhesive to the laminated sheet substrate or by transfer coating.

[0061] Transfer coating is a method in which an adhesive is applied to release paper, which is then laminated onto a laminate sheet to transfer the adhesive. Transfer coating is performed using methods such as die coating. The adhesive is pumped from an adhesive dissolving tank and extruded from the tip of a die (coating nozzle) onto the release paper, which is pulled out by a backup roll. The amount of adhesive applied is determined by controlling the pump rotation speed for slurry supply, the machine line speed, coating width, etc., to achieve a consistent thickness. The release paper coated with adhesive is then laminated to one side of a laminated sheet. The layer of adhesive, applied to a consistent thickness, is then laminated directly to the laminate sheet, so the surface shape of the adhesive layer will follow the surface shape of the laminate sheet. The resulting single-sided adhesive laminate sheet with release paper is then wound onto a roll.

[0062] Next, a release paper coated with the same adhesive as above is attached to the other side of the laminated laminate sheet to create a double-sided adhesive laminate sheet with release paper, which is then wound up into a roll.

[0063] The sheet, which has adhesive applied to both sides, is cut, the four sides are reinforced, and then grommets are added to allow for hanging at the site of use. The standard product dimensions are approximately 45 cm wide and 2 m long, with two grommets added at the four corners and every 50 cm along the length. This allows it to be cut appropriately in 50 cm increments depending on the site conditions and adjusted to the appropriate size for use. [Example]

[0064] Examples and comparative examples using the pressure-sensitive adhesive laminate sheet according to the present invention are shown below, but the present invention is not limited to these examples. [Example]

[0065] A test for capturing tiny insects was carried out on the adhesive laminate sheet according to the present invention and other companies' products (H sheet, M sheet, and L sheet). Test location: Koizumi Seima Co., Ltd. Shiga factory test house (around and inside the house) Period: September 6th to November 15th, 2019 Targets for capture: Thrips, whiteflies, and other tiny insects Product contents: -The sheet of the present invention (large size, a sheet of laminated polyethylene fabric with adhesive applied to one or both sides), 450mm x 2000mm H-sheet (laminated synthetic resin [inside the greenhouse is synthetic resin and paper] double-sided adhesive sheet), 257mm x 100mm M sheet (laminated synthetic resin double-sided adhesive sheet), 220mm x 100mm L sheet (laminated paper double-sided adhesive sheet), 220mm x 100mm

[0066] [Table 1]

[0067] Table 1 shows the results of counting the number of insects captured after each of the above sheets was tied to upright gardening poles around the Shiga factory test house and left for the above period. The adhesive surface color (single or double sided) and number of sheets installed are as follows: present invention: 1 sheet with blue color on one side, 1 sheet with yellow color on one side, and 1 sheet with transparent color on one side; H sheet: 1 sheet with blue color on both sides, and 1 sheet with yellow color on both sides; M sheet: 1 sheet with blue color on both sides, and 1 sheet with yellow color on both sides.

[0068] The results of the number of individuals captured are as follows. With the sheet of the present invention, 111 were captured in yellow, 697 in blue, and 9 in the transparent sheet. With the H sheet, 38 were captured in yellow and 99 in blue, and with the M sheet, 3 were captured in yellow and 1 in blue.

[0069] [Table 2]

[0070] Table 2 is a graph of the results of Table 1, where the number of captures was converted to the number of captures per 10 cm x 10 cm on one side (referred to as "unit capture number") in order to compare the number of captures in the same area. In descending order, the number of captures was 110.6 for the sheet of the present invention (blue), 39.6 for the H sheet (blue), 17.6 for the sheet of the present invention (yellow), 15.2 for the H sheet (yellow), 1.4 for the sheet of the present invention (transparent), 1.4 for the M sheet (yellow), and 0.5 for the M sheet (blue).

[0071] The number of catches per unit was higher for the blue sheet, and in particular the number of catches for the sheet of the present invention (blue) was about three times the number of catches for the second-place H sheet (blue). Also, the sheet of the present invention (transparent color) showed a number of catches equal to or greater than that of the M sheet, although the numerical value was lower.

[0072] [Table 3]

[0073] Table 3 shows the results of the above analysis broken down by taxonomic group of the captured insects. The overwhelming majority of the captured insects were Thripidae, which is thought to be due to the environment around the test greenhouse at this time of year.

[0074] For thrips, the inventive sheet had 106 in yellow, 696 in blue, and 7 in transparent. The H sheet had 31 in yellow and 98 in blue, and the M sheet had 3 in yellow and 1 in blue. Similarly, for the Aphididae family, the sheet of the present invention gave a score of 5 for yellow and 1 for transparent. On the H sheet, there were 3 yellow and 1 blue catches, and on the M sheet, no catches were observed. Similarly, for the family Agromyzidae, the inventive sheet yielded 1 blue and 1 transparent. The H sheet yielded 4 yellow. No captures were observed with the M sheet.

[0075] [Table 4]

[0076] Table 4 is a graph showing the results of Table 3, with the unit capture numbers calculated and sorted in descending order. For the Thripidae family, the order was: sheet of the present invention (blue) 110.5, H sheet (blue) 39.2, sheet of the present invention (yellow) 16.8, H sheet (yellow) 12.4, M sheet (yellow) 1.4, present invention (transparent) 1.1, M sheet (blue) 0.5. Similarly, for Aphididae, the order was H sheet (yellow) 1.2, the sheet of the present invention (yellow) 0.8, H sheet (blue) 0.4, and the sheet of the present invention (transparent) 0.2. Similarly, for the family Agromyzidae, the scores were H sheet (yellow) 1.6, the sheet of the present invention (blue) 0.2, and the sheet of the present invention (transparent) 0.2 in that order.

[0077] Thrips appear to prefer the color blue, with the sheet of the present invention (blue) followed by the H sheet (blue). The number of captured Aphididae and Agromyzidae was generally low. The sheet of the present invention (transparent) also captured all of the tiny insects, albeit in small numbers.

[0078] [Table 5]

[0079] Table 5 shows the results of each sheet being hung by a string in the space inside the Shiga Factory test house and kept for the period mentioned above, and the number of captures counted after the period ended. The adhesive surface color (single or double sided) and number of sheets installed are as follows: present invention: 2 blue sheets on both sides, 2 yellow sheets on both sides; H sheet: 2 blue sheets on both sides, 2 yellow sheets on both sides; M sheet: 2 blue sheets on both sides, 2 yellow sheets on both sides (synthetic resin); L sheet: 2 yellow sheets on both sides (paper). There were many tiny insects of the whitefly family in the test house, and a small number of tiny insects of the thrips family.

[0080] State the results of the number of individuals captured For the sheets of the present invention, the yellow yields were 4,944 and 2,616, and the blue yields were 5 and 12. For the H sheets, the yellow yields were 5,504 and 2,208, and the blue yields were 4 and 96. For the M sheets, the yellow yields were 1,440 and 1,520, and the blue yields were 56 and 31. For the L sheets (paper), the yellow yields were 1,568 and 3,472.

[0081] [Table 6]

[0082] Table 6 is a graph of the results (unit capture number) of Table 5. In descending order, the results were H sheet (yellow) 2,201.6, L sheet (yellow paper) 1,388.8, H sheet (yellow) 883.2, the sheet of the present invention (yellow) 784.8, M sheet (yellow) 690.9, and M sheet (yellow) 654.6.

[0083] In terms of the number of catches per unit by color, yellow is overwhelmingly the most common, with the H sheet (yellow) capturing about 60% more than the second-place L sheet (made of yellow paper). The sheet of the present invention is roughly the same as the M sheet (yellow), showing a certain number of catches per unit.

[0084] [Table 7]

[0085] Table 7 shows the results of the above analysis broken down by taxonomic group of the insects caught. The overwhelming majority of the insects caught were whiteflies, which is thought to be due to the environment around the test house at this time of year.

[0086] For the whitefly family, the inventive sheets had 4,944 and 2,616 in yellow and 72 and 12 in blue. The H sheets had 5,504 and 2,208 in yellow and 144 and 96 in blue, the M sheets had 1,440 and 1,520 in yellow and 56 and 31 in blue, and the L sheets had 1,568 and 3,472 in yellow (paper). Similarly, for thrips, the inventive sheet gave 2 in yellow and 5 and 5 in blue. The H sheet gave 4 in blue, and no capture was observed on the M sheet.

[0087] [Table 8]

[0088] Table 8 is a graph of the results (unit capture number) of Table 7. In descending order, for whiteflies, the order was H sheet (yellow) 2,201.6, L sheet (yellow paper) 1,388.8, H sheet (yellow) 883.2, the sheet of the present invention (yellow) 784.8, and M sheet (yellow) 690.9. Although thrips were caught in small numbers overall, three out of four sheets of the present invention showed a record of capture. [Example]

[0089] A test for capturing tiny insects was carried out on the adhesive laminate sheet according to the present invention and a product from another company (M sheet). Test location: Hyogo Prefectural Agriculture, Forestry and Fisheries Technology Center (inside a greenhouse) Period: November 21, 2019 ~ December 12, 2019 Target to capture: Onion thrips Product contents: - This invention (woven sheet, a sheet of laminated polyethylene fabric with adhesive applied to both sides), 450mm x 2000mm M sheet (laminated synthetic resin double-sided adhesive sheet), 220mm x 100mm Installation location: Inside the house Number of installations: This invention: 8 blue double-sided adhesive sheets, 8 yellow double-sided adhesive sheets Medium sheet: 8 sheets of yellow double-sided adhesive

[0090] [Table 9]

[0091] Table 9 shows the test results for the present invention sheet (8 yellow sheets), the present invention sheet (8 blue sheets), and the M sheet (8 yellow, paper sheets), in which the target sheets were hung on wires at 8 locations in the greenhouse for the above-mentioned period and the number of captured insects was counted after the period. The unit capture number (number of captured insects per unit of 10 cm x 10 cm on one side) was an average of 172 for the present invention sheet (yellow), 150.13 for the present invention sheet (blue), and 53.25 for the M sheet (yellow, paper).

[0092] [Table 10]

[0093] Table 10 is a graph of Table 9. The capture numbers of the sheets of the present invention all show a high unit capture number. [Industrial Applicability]

[0094] The technology according to the present invention provides a woven or knitted sheet that attracts and captures tiny insects without using pesticides, and has high industrial applicability while preserving the environment. [Explanation of symbols]

[0095] 100 Attraction and Capture Sheets 200 Warp threads that make up the attraction and capture sheet 210 Warp folding part 300 Weft threads that make up the attraction and capture sheet 310 Weft folding part 400 void 500 Cross-section of the attraction and capture sheet (after forming the coating layer and adhesive layer) 600 coating layer 700 adhesive layer

Claims

1. A woven sheet for attracting micro-insects, wherein the warp and weft threads constituting said sheet are both flat yarns obtained by slitting and stretching a translucent synthetic resin film, and the total warp width of all the warp threads constituting said sheet exceeds the overall width of said sheet, or the total weft width of all the weft threads constituting said sheet exceeds the overall length of said sheet, and are densely arranged.

2. 2. The woven sheet for attracting small insects according to claim 1, wherein the warp or weft threads are flat yarns made by slitting and stretching a translucent synthetic resin film and then folding it before weaving.

3. A micro-insect trapping sheet characterized in that a substance for trapping micro-insects is added to the surface of the warp or weft threads constituting the woven sheet for attracting micro-insects described in claim 1 or claim 2.

4. A micro-insect capture sheet characterized in that a coating layer made of a translucent coating material is formed on both sides of a woven sheet for attracting micro-insects as described in claim 1 or claim 2, and an adhesive layer made of a translucent adhesive material is formed on top of the coating layer.

5. 5. The minute insect trapping sheet according to claim 4, wherein the translucent covering material is a translucent covering material having a yellow, blue or green color.

6. 6. The minute insect trapping sheet according to claim 4, wherein the adhesive layer is formed by transfer coating the adhesive.

7. A method for manufacturing a micro-insect trapping sheet, comprising: slitting a translucent synthetic resin film and then stretching it; using the resulting flat yarns as warp and weft threads to form a woven sheet; densely arranging and wefting all of the warp threads or all of the weft threads that form the woven sheet so that the total width of all of the warp threads or all of the weft threads that form the woven sheet exceeds the overall width or length of the woven sheet; covering both sides of the resulting woven sheet with a translucent covering material; and forming an adhesive layer made of a translucent adhesive material on top of the covering layer made of the covering material.

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